I doubt very much that the majority of Catholics are going to change their votes. They voted for Obama in '08, and they'll vote for him again. Most of them were "baptized Democrat," and they're not going to change. The "social justice" types in particular won't change.
The Bishops sold their souls to the Devil a long time ago when they accepted government income transfers as the equivalent of private charity. They are now learning the truth of the maxim, "He who would sup with the Devil had best use a long spoon." But it's too late to rally the Catholic laity.